Question

what is a hysteresis loop?

Answer 1

Hysteresis is the dependence of the state of a system on its history. For example, a magnet may have more than one possible magnetic moment in a given magnetic field, depending on how the field changed in the past









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Answer 2

A hysteresis loop helps understand the magnetic properties of a material. Only shown by ferromagnetic materials. The fact behind hysteresis is that once the magnetization I is increased, it will never decrease back to it's original value.

It helps in designing electromagnets, ac generators etc.
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